iDatalink HRN-RR-SU1 and Maestro ADS-MRR Interface Module allows installation of a new iDatalink-ready receiver in select Subaru models (also requires the Maestro ADS-MRR module) only works with select Alpine, JVC, Kenwood and Pioneer receivers with iDatalink port retains steering wheel audio controls retains your Subaru's amplifier and subwoofer (including the fader) displays engine gauges and Check Engine codes on touchscreen iDatalink Maestro ADS-MRR Interface Module Connect a new stereo and retain the steering wheel audio controls and factory amps in select 2006-up vehicles allows installation of a new car stereo in select 2006-up Chrysler, Fiat, Ford, GM, Honda, Subaru, Toyota, and VW vehicles works with required vehicle-specific harness (sold separately) to retain factory steering wheel audio controls, retain the factory amp if present, and integrate all car stereo connections retains factory convenience features (OnStar, SYNC, Uconnect, and more) with select Kenwood, Alpine, Pioneer, and JVC touchscreen receivers displays engine performance data on touchscreen with select Kenwood, JVC, Pioneer, and Alpine multimedia receivers not compatible with Mac dimensions: 4-1/8"W x 3/4"H x 2-7/8"D